A low-E (low-emissivity) coat is a microscopically thin glazing for windows that changes the amount of heat that can pass through them. Low-E coats save money and energy by maintaining a more stable temperature inside buildings, and thus reducing the need for heating or cooling. They can also block UV rays. A high solar gain low-E coat allows more heat to pass through a window, and is useful for colder climates. A low solar gain coat is appropriate for hot climates because it allows less heat to pass through a window. A hard coat is longer lasting than a soft coat.
Read the definition of other window ratings: U-factor, Solar Heat Gain Coefficient, and Visible Transmittance, on ecomii.
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Learn about energy efficient windows on ecomii.
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